Python Base64 decode failed error in a function

Question

I have the error as "Base64 decode failed" using the following function. The following function is used to call the model that is saved in Google AI Platform. However, the data input has to be base64 serialized, hence, I include the get_serialized_example(raw) function within the tfx_test(request). Any help and advice are appreciated. Thanks in advance!

def tfx_test(request):
    
    #User Inputs
    project = request.project
    model = request.model
    signature = request.signature
    version = request.version
    
    #Data inputs Base64 encoder 
    
    def get_serialized_example(raw):
        return tf.train.Example(
                features=tf.train.Features(
                  feature={"value":
                              tf.train.Feature(bytes_list=tf.train.BytesList(value=[raw]))
                          }
                    )
                ).SerializeToString()


    b64_country_code = base64.b64encode(get_serialized_example(request.country_code)).decode('utf-8')
    
    b64_project_type = base64.b64encode(get_serialized_example(request.project_type)).decode('utf-8')
    
    # ml.googleapis.com
    service = googleapiclient.discovery.build('ml', 'v1')
    name = 'projects/{}/models/{}'.format(project, model)

    if version is not None:
        name += '/versions/{}'.format(version)

    response = service.projects().predict(
        name=name,
        body={
            'signature_name': signature,
            'instances': [
                    {
                       "examples":{"b64": b64_country_code[0],
                                   "b64": b64_project_type[0]}
                    }]
        }
    ).execute()

    if 'error' in response:
        raise RuntimeError(response['error'])

    return response['predictions']

Are you getting the error in your code, or does it come back from Google? — Roy2012
– Roy2012, Commented Jun 24, 2020 at 4:34

Roy2012 · Accepted Answer · 2020-06-24 04:37:10Z

1

It seems that you're not senfing a valid base64 string. Instead, you're just sending the first character:

"examples":{"b64": b64_country_code[0],
            "b64": b64_project_type[0]}

The first character of a base-64 string is not a valid base 64 string, as base64 encoding takes every three characters and encodes them as four.

answered Jun 24, 2020 at 4:37

Roy2012

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7 Comments

LLTeng Over a year ago

Hi, thanks for the comment. if I take out the [0], I have the following error: TypeError: list indices must be integers or slices, not str.

Roy2012 Over a year ago

Do you get this error from Google, or from the client side code?

LLTeng Over a year ago

From client side.

LLTeng Over a year ago

And the data input is as follow: class request(): country_code = b"AU" project_type = b"Delivery". I ran a unit test on the function, and that's what I got as the error too.

Roy2012 Over a year ago

Sorry, you'll have to provide more information - perhaps in a new question with all the details.

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